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Note: This method is not available from Web content. It requires elevated privileges to access.
XMLHttpRequest.mozBackgroundRequest is a boolean. Indicates whether or not the object represents a background service request. If true, no load group is associated with the request, and security dialogs are prevented from being shown to the user.
In cases in which a security dialog (such as authentication or a bad certificate notification) would normally be shown, the request simply fails instead.
Note: This property must be set before calling open().